Nordie Paoli fork seals; the right hand leg has the damper control, the left hand leg has the spring, usually only the right hand leg seals produce enough pressure in use to leak, so if the left hand leg is not leaking no need to change its seal, keep it as a spare.
The allballs 41x53x10.5 seal is P/No 55-116 or 41x53x8 seal with spacers is 55-117
You will need 400cc SAE 10 fork oil in the damped right hand leg, as it has no damping any clean oil just to lubricate the bits is OK in the left leg
The bike must be supported when you take the wheel out or it will fall over a bike stand under the engine or suspended from the bars with an engine crane or hoist is my preferred method.
As O-B said it take a bit of pulling after the circlip is removed to get the gubbins out with the fork spindle end in a vice (protect it with 2 bits of wood) and use the chromed end like a slide hammer, I found the AllBalls seals fitted much easier than the originals came out!!
Good luck
John